Case Report: Using basic liver function tests as a guide to suspected Wilson’s disease

We present a case of a 36-year-old female patient who presented with subacute liver disease with a history of alcohol abuse. On basic liver function tests (LFT), she had aspartate transaminase / alanine transaminase > 2.2 and alkaline phosphatase / total bilirubin < 4. This pattern in acute liver failure patients signifies Wilson’s disease. Its presence in our patient with subacute liver disease also prompted us to suspect Wilson’s disease and we extended the liver disease screen to include slit lamp eye examination for Kayser-Fleischer rings, serum ceruloplasmin and 24-hour urinary copper level, which led to the diagnosis. She improved clinically and biochemically with zinc acetate therapy. As screening for rare diseases is not always possible in low-income countries, this case demonstrates the usefulness of the basic LFT as a guide for suspecting Wilson’s disease in patients with liver disease.


Introduction
Wilson's disease is an autosomal recessive disorder of copper metabolism that leads to liver disease and neuropsychiatric manifestations. The majority of patients are diagnosed between the ages of five and 35 years. This disease is usually suspected in patients with liver disease of uncertain etiology, especially if accompanied by neuropsychiatric symptoms. But it can also present with liver abnormalities alone. Untreated, this disease is universally fatal, with patients dying from cirrhosis or progressive neurologic disease. 1 Hence its timely recognition is important. It is not usually diagnosed in resource-limited countries as diagnostic tests are not easily available. Here we present a case of Wilson's disease from Nepal. The patient presented with liver disease (without neuropsychiatric features), and we discuss how basic liver function test parameters can be used as a guide to suspected Wilson's disease.

Case
A 36-year-old woman from Lalitpur, Nepal presented to the emergency department of Patan Hospital in December 2018, with complaints of abdominal distension and yellowish discoloration of the skin for two months and shortness of breath for the last 10 days. She had no history of fever, cough, abdominal pain, nausea, vomiting, black stools, altered sensorium or abnormal body movement. She had a history of consuming home-made alcohol, almost daily for 12 years, although quantification of the intake could not be done.
On examination she appeared icteric and pale. Blood pressure was 90/60 mm Hg, pulse 78 beats per minute, respiratory rate 20 breaths per minute, temperature 98.7 Fahrenheit and oxygen saturation of 97% at room temperature. Abdomen was distended and non-tender, liver and spleen were not palpable and shifting dullness was present. Chest examination showed decreased air entry. Bilateral pitting pedal edema was noted. Neurological examinations did not reveal any abnormality. She was looked after at another health care center three weeks prior to her admission as a case of alcoholic liver disease. She stopped drinking alcohol, but without improvement in her symptoms. Her investigations are as shown in Table 1.
Ultrasound of the abdomen showed hepatosplenomegaly and gross ascites. Ascitic fluid tap was done and sent for analysis, which showed WCC 100 cells/μL (neutrophils 60% and lymphocytes 40%), protein 1 gm/dl and albumin 0.5 gm/dl. Upper gastrointestinal endoscopy showed small sized esophageal varices and mild portal hypertensive gastropathy. Hepatitis B surface antigen (HBsAg) and hepatitis C antibody were nonreactive. Direct Coombs test was negative. Patient was started on furosemide 20 mg once daily, spironolactone 50 mg once daily and thiamine 100 mg once daily.
Slit lamp examination of her eyes showed the presence of Kayser-Fleischer (KF) rings. Twenty-four-hour urinary copper was 85.70 (normal < 60) μg and serum ceruloplasmin level was 23 (normal 20-60) mg/dl. The diagnosis of subacute liver failure with Wilson's disease was made. We started oral zinc acetate (50 mg elemental zinc thrice daily) along with the above drugs and she was discharged in one week of admission. There was clinical and biochemical improvement as seen during one-month (January 2019) and 11 months (November 2019) follow-up visits (Table 1).

Discussion
This female patient who presented with features of chronic liver disease had a history of alcohol intake for almost 12 years. Nepal is a low-income country in South Asia, and a full chronic liver disease screening (including tests for Wilson's disease, autoimmune hepatitis, hemochromatosis) is usually not possible in the Nepali health setup. The limited screen includes alcohol history, history of any drug or toxin use and serologies for hepatitis B and C. 2 However, the people mostly consume home-made alcohol in Nepal, and the exact quantification is usually not possible to estimate whether the amount of intake is significant enough to cause liver disease or not. 3 We usually ascribe liver disease in any patient to the alcohol, no matter the amount of intake by the patient, especially if serologies are nonreactive and there is no drug or toxin exposure. In our patient with a history of alcohol use, we extended the tests beyond the conventional limited screen, which led to a diagnosis of Wilson's disease.
Basic liver function tests (LFT) including bilirubin, transaminases level and alkaline phosphatase (ALP) are available in most of the health centers in Nepal. In any patient with liver disease who presents with acute liver failure, the combined

REVISED Amendments from Version 1
This revised version contains the minor changes as had been suggested by the reviewers, including addition of reticulocyte and indirect bilirubin parameters in Table 1.
Any further responses from the reviewers can be found at the end of the article Table 1. Laboratory parameters of the patient before and after treatment for Wilson's disease. 2) provides sensitivity and specificity of 100% for diagnosing Wilson's disease. 4 In our patient, ALP/total bilirubin was 3.09 and AST/ALT was 3.4 during the admission ( Table 2). Although she did not have acute liver failure during the presentation, we used this pattern of LFT (the 'Wilson's pattern') as a guide to suspect the possibility of Wilson's disease and ordered slit lamp examination of eyes for KF rings, serum ceruloplasmin level and 24-hour urinary copper tests.

Parameters
The diagnosis was made using the Leipzig scoring system for Wilson's disease. 5 Total points obtained were four (two for KF ring, one for Coombs negative hemolytic anemia (anemia with increased reticulocyte percentage and increased indirect fraction of bilirubin), one for high 24-hour urinary copper), which established the diagnosis of Wilson's disease. However, she had no neurologic symptoms and her serum ceruloplasmin level was normal. Liver copper and mutation analysis were not performed.
The preferred treatment choice for patients with Wilson's disease with cirrhosis is copper chelator like D-penicillamine or trientene initially, followed by oral zinc therapy in maintenance. However, the treatment with zinc acetate was started in this case because of unavailability of chelating agents. On follow up in one month, she had no abdominal distension and jaundice. LFTs were improved, which continued to improve till 11 months follow up (Table 1). Even the 'Wilson's pattern' of LFTs was resolved with treatment ( Table 2).

Conclusion
LFTs are simple and readily available tests even in remote parts of Nepal, done in all patients with liver disease. As screening for rare diseases is not always possible in low-income countries, this case demonstrates the usefulness of the 'Wilson's pattern' LFT as a guide for suspecting Wilson's disease in patients with liver disease. However, the sensitivity and specificity of this pattern is yet to be studied in patients with subacute liver disease.

Data availability
All data underlying the results are available as part of the article and no additional source data are required.

Consent
Written informed consent for publication of the clinical details and/or clinical images was obtained from the patient. Open Peer Review diagnose. The authors of this case report that after an initial diagnosis of alcoholic liver disease and symptoms that did not improve after cessation of alcohol consumption, further etiologies were considered. Notably, the authors applied the "Wilson Pattern" of liver function tests as an initial motivation to specifically assess Wilson Disease, including slit lamp examination and parameters that can be used in the Leipzig Score.
The overall message of this report is that the Wilson pattern of liver function tests is important in diagnosis, particularly in developing countries that may be resource-limited. This message is not particularly novel, but it is valuable to highlight. The Wilson pattern was developed based on patients with acute liver failure, however. It is not yet known whether the specificity and sensitivity of the test is 100% in subacute liver disease-as the authors note under the Conclusion section. This observation as well as the qualifier are useful to highlight and enhance the importance of the report.
It appears from the report that the choice to use Zn was made due to the lack of chelator availability. The report indicates "50 mg elemental zinc thrice daily." It is expected that a zinc salt was prescribed, where it would be important to report the specific salt used. The observation that the patient's liver function tests improved with zinc supplementation is promising and may be useful to others. Given the apparent ability to assess 24-hour urinary Cu, it would be interesting to know if this value changed with treatment.
In summary, this is an important case report in that it promotes consideration of liver function tests in suspicion of Wilson Disease, which is particularly valuable in locations where specialized diagnostic resources are limited. The apparent successes in the case are also notable.

Is the background of the case's history and progression described in sufficient detail? Yes
Are enough details provided of any physical examination and diagnostic tests, treatment given and outcomes? Yes Is sufficient discussion included of the importance of the findings and their relevance to future understanding of disease processes, diagnosis or treatment? Partly Is the case presented with sufficient detail to be useful for other practitioners? Partly